The 2015 335i with N55 engine is a solid performer but has expensive known issues tied to the oil cooler system, charge pipe failures, and turbo-related components. The transmission mount and valve cover leaks are maintenance items you'll absolutely face.
Oil Filter Housing Gasket & Oil Cooler Leaks
Common · medium severity
Typical onset: 60,000-90,000 mi
Symptoms: Oil pooling under engine, Burning oil smell from exhaust manifold heat, Low oil warning, Oil residue on undercarriage
Fix: Replace oil filter housing gasket and often the entire oil cooler assembly as the internal o-rings fail. 3-4 hours labor. Must be addressed before it drips onto starter or exhaust.
Estimated cost: $800-1,400
Charge Pipe Failure (Boost Pipe)
Common · high severity
Typical onset: 50,000-100,000 mi
Symptoms: Sudden loss of power under boost, Loud hissing from engine bay, Limp mode activation, Check engine light with underboost codes
Fix: The plastic charge pipe between turbo and intercooler cracks at the crimp joint. Upgrade to aluminum aftermarket unit is standard practice. 1.5-2 hours labor.
Estimated cost: $400-700
Valve Cover & Valve Cover Gasket Leaks
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Oil smell in cabin with heat on, Oil seepage around valve cover perimeter, Misfires if oil enters spark plug wells, Smoke from engine bay
Fix: Replace entire valve cover assembly including integrated PCV system and gasket. BMW updated design addresses earlier failures. 3-4 hours labor.
Estimated cost: $1,200-1,800
Transmission Mount (Motor Mount) Failure
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: Clunk when shifting from Park to Drive, Vibration at idle, Excessive driveline movement under acceleration, Transmission whine transmitted into cabin
Fix: The rubber in the transmission mount deteriorates. Common on all F30 platforms. 1.5-2 hours labor including subframe access.
Estimated cost: $400-650
Turbocharger Wastegate Rattle
Occasional · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: Rattling noise at idle or light throttle, Noise disappears under boost, No performance loss initially, Can progress to overboosting or underboost codes
Fix: Wastegate actuator arm bushings wear causing rattle. Eventually requires turbo replacement or rebuild. N55 single-turbo setup means one unit. 6-8 hours labor for replacement.
Estimated cost: $2,000-3,500
VANOS Solenoids & Timing System Issues
Occasional · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Rough cold start, Rattling on startup, Check engine light with camshaft timing codes, Poor fuel economy, Loss of low-end torque
Fix: VANOS solenoids fail or timing chain stretch occurs. Solenoids alone are 2-3 hours; full timing service with guides and chain is 12-15 hours. Inspect at 100k miles.
Estimated cost: $800-1,200 (solenoids only) or $3,500-5,500 (full timing)
Water Pump & Thermostat Housing Leaks
Occasional · high severity
Typical onset: 70,000-110,000 mi
Symptoms: Coolant warning light, Visible coolant leak under vehicle, Overheating, Steam from engine bay, Coolant odor in cabin
Fix: Electric water pump fails or thermostat housing cracks. Replace both together as preventive maintenance. 3-4 hours labor. Overheating can warp head.
Estimated cost: $1,000-1,600
Owner tips
Budget $2,000-3,000 in the first year of ownership for deferred maintenance on a 100k-mile example
Switch to quality synthetic oil and maintain 7,500-mile intervals to preserve VANOS and turbo longevity
Upgrade to aluminum charge pipe preemptively if the original plastic one is still installed
Inspect oil filter housing and valve cover for seepage at every oil change — catch leaks early
Avoid extended idling in hot weather; electric water pump failures accelerate with heat cycling
Buy one if you can wrench or have a trusted independent BMW shop — great driving experience but maintenance costs will exceed Japanese competitors by 50-70%.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: AGM battery required; located in trunk; registered battery replacement required via BMW coding
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Control Modules — 2015 BMW 335i
Every control module on the 2014-2015 BMW 335i — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
AIR BAGS:FRONTAL:DRIVER SIDE:INFLATOR MODULE · 24V527000
2024-07-11
BMW of North America, LLC (BMW) is recalling certain 2015 6 Series Gran Coupe, 2014 5 Series Gran Turismo, 2014 5 Series Sedan, 2015 6 Series Convertible, 2015 6 Series Coupe, 2014 X5, 2013-2014 X3, 2014-2015 3 Series Sedan, 2014 4 Series Coupe, 2014 4 Series Convertible, 2014 3 Series Gran Turismo, and 2015 4 Series Gran Coupe vehicles. Please see the recall report for the complete list of models. The driver's air bag inflator may explode during deployment, due to a manufacturing defect.
Consequence: An inflator explosion may result in sharp metal fragments striking the driver or other occupants, increasing the risk of injury or death.
Remedy: The driver's front air bag will be replaced, free of charge. Owner notification letters were mailed September 6, 2024. Owners may contact BMW customer service at 1-800-525-7417.
AIR BAGS:SIDE/WINDOW · 24V288000
2024-04-24
BMW of North America, LLC (BMW) is recalling certain 2014-2015 2 Series Coupe (228i, 228i xDrive, M235i), 3 Series Sedan (320i, 320i xDrive, 328i, 328i xDrive, 335i, 335i xDrive, M3, 328d, 328d xDrive), 4 Series Coupe (428i, 428i xDrive, 435i, 435i xDrive, M4), and 2015 4 Series Gran Coupe (428i, 428i xDrive, 435i, 435i xDrive) vehicles. The head air bag inflator may fail at the weld joint, which can cause gas to leak from the inflator or result in an inflator rupture.
Consequence: An inflator that ruptures may cause sharp metal fragments to enter or exit the vehicle, increasing the risk of injury. Additionally, an inflator that leaks gas may only partially inflate during a crash, increasing the risk of injury.
Remedy: Dealers will replace the head air bags, free of charge. Owner notification letters were mailed November 4, 2024. Owners may contact BMW customer service at 1-800-525-7417.
EXTERIOR LIGHTING · 15V520000
2015-08-17
BMW North America, LLC (BMW) is recalling certain model year 2012-2015 320i, 320xi, 328i, 328xi, 335i, 335xi, and ActiveHybrid3 vehicles manufactured October 20, 2011, to June 22, 2015, 2014-2015 328xi Sports Wagon vehicles manufactured March 21, 2013, to March 17, 2015, 2014-2015 328d, 328xd vehicles manufactured June 28, 2013, to April 21, 2015, and 2014-2015 328xd Sports Wagon vehicles manufactured July 5, 2013, to April 21, 2015. The affected vehicles may have been programmed with new software that inadvertently makes the front side marker lights inoperative in conjunction with the parking lights or the headlights. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamps, Reflective Devices, and Associated Equipment."
Consequence: If the side marker lights do not illuminate, the vehicle may be less visible at night, increasing the risk of a crash.
Remedy: BMW will notify owners, and dealers will upload revised software to correct the issue, free of charge. The recall began on October 7, 2015. Owners may contact BMW customer service at 1-800-525-7417 or by email at [email protected].
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2015 BMW 335i 3.0L I6 Turbo N55 and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.